21905205

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{29803}}^1$

素因数の和:29825

約数の個数: 24

約数和(自身を含む): 40771872

約数和(自身を除く): 18866667

約数列:

[1, 3, 5, 7, 15, 21, 35, 49, 105, 147, 245, 735, 29803, 89409, 149015, 208621, 447045, 625863, 1043105, 1460347, 3129315, 4381041, 7301735, 21905205]

約数ペア:

[(1, 21905205), (3, 7301735), (5, 4381041), (7, 3129315), (15, 1460347), (21, 1043105), (35, 625863), (49, 447045), (105, 208621), (147, 149015), (245, 89409), (735, 29803)]